you need t flower it at least a week if not 2 before you can tell. theres a big difference trust me. the male plants have somewhat of a different look to them. also, if you look at the stalk where it meets a node, they all have small growths there, but if they are balls, you havew a boy, if you see hairs coming through its a girl. you probably wo't be able to tell for another couple weeks if you switch your cycle to 12/12